Dive into JavaScript Functions(Basics only)

When I first started learning JavaScript, functions felt simple… until they didn’t. I knew how to write them. I knew how to call them. But terms like parameters, arguments, function expressions, and arrow functions made everything feel more complicated than it needed to be. So in this post, I’ll explain them the way I wish someone explained them to me when I was starting out. When you first learn JavaScript, functions can feel abstract. add(a, b) sum(2, 3) But in real projects, functions are doing things like: Calculating total price in a cart Validating a login form Validating a login form Sending data to a server So let’s understand functions using examples that feel more like real life. First, What Is a Function? A function is just a reusable block of code. Instead of writing the same code again and again, you write it once inside a function and reuse it. Think about an e-commerce website. You might need to calculate the total price of items in a shopping cart. Instead of writing th